Functional differences in the microbial processing of recent assimilates under two contrasting perennial bioenergy plantations
Functional differences in the microbial processing of recent assimilates under two contrasting perennial bioenergy plantations
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DOI：
10.1016/j.soilbio.2017.07.026
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发表时间：
2017-11
影响因子：
9.7
通讯作者：
D. Elias;R. Rowe;oria Pereira;A. Stott;C. Barnes;G. Bending;N. McNamara
中科院分区：
文献类型：
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作者：
D. Elias;R. Rowe;oria Pereira;A. Stott;C. Barnes;G. Bending;N. McNamara
尽管我们对植物碳输入与土壤微生物之间的相互作用的理解有限，但土地利用变化驱动的微生物群落变化可能对地下碳循环和储存产生影响。我们利用磷脂脂肪酸（PLFA）分析了两种不同的英国多年生生物能源作物——短轮作柳树（SRC）和芒草（miscanthus Giganteus）的微生物群落，并使用13c脉冲标记研究了碳(C)同化物是如何通过植物组织转移到土壤微生物中的。总PLFA = 47.70±1.66 SE μ PLFA g−1干重土壤，F:B = 0.27±0.01 SE)高于紫穗槐（总PLFA = 30.89±0.73 SE μ PLFA g−1干重土壤，F:B = 0.17±0.00 SE）。通过标记c的处理对比，突显了微生物群落的功能差异，SRC柳树将检测到的总13c分配给真菌PLFA的44%，而在芒草处理下为9%，并且与芒草相比，SRC柳树土壤中通过土壤呼吸返回大气的13c要多380%。研究结果阐明了细菌和真菌在这两种多年生生物能源作物下近期植物源碳周转中的作用，并为研究土地利用变化对生物能源微生物群落组成的影响提供了重要证据。
Land use change driven alteration of microbial communities can have implications on belowground C cycling and storage, although our understanding of the interactions between plant C inputs and soil microbes is limited. Using phospholipid fatty acids (PLFA's) we profiled the microbial communities under two contrasting UK perennial bioenergy crops, Short Rotation Coppice (SRC) willow andMiscanthus Giganteus(miscanthus), and used13C – pulse labelling to investigate how recent carbon (C) assimilates were transferred through plant tissues to soil microbes. Total PLFA's and fungal to bacterial (F:B) ratios were higher under SRC willow (Total PLFA = 47.70 ± 1.66 SE μg PLFA g−1dry weight soil, F:B = 0.27 ± 0.01 SE) relative to miscanthus (Total PLFA = 30.89 ± 0.73 SE μg PLFA g−1dry weight soil, F:B = 0.17 ± 0.00 SE). Functional differences in microbial communities were highlighted by contrasting processing of labelled C. SRC willow allocated 44% of total13C detected into fungal PLFA relative to 9% under miscanthus and 380% more13C was returned to the atmosphere in soil respiration from SRC willow soil compared to miscanthus. Our findings elucidate the roles that bacteria and fungi play in the turnover of recent plant derived C under these two perennial bioenergy crops, and provide important evidence on the impacts of land use change to bioenergy on microbial community composition.